Revenue - Narrative (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Contract assets	$ 0	$ 0
Deferred revenue	25,623,000	23,830,000
Courses in Progress
Disaggregation of Revenue [Line Items]
Future revenue	14,800,000	13,800,000
Future Courses
Disaggregation of Revenue [Line Items]
Future revenue	$ 10,800,000	$ 10,000,000.0